search

pmelchior / skymapper

Mapping astronomical survey data on the sky, handsomely
MIT License
43 stars 15 forks source link

Ra break for Consterllation Hydra #26

Closed oxno2 closed 5 years ago

oxno2 commented 5 years ago

Hi, I try to use Skymapper to draw the constellation Hydra, but I found for this constellation, there is a break in RA. I think the problem might be there is a break for RA value at RA=180. Are there any methods for me to correct this? 7

Also, when I draw the constellation Ursa Major, there is a projection problem. I want to rotate the graph to left by 90 degrees and revert the direction of texts. Are there any methods to do this?

8

pmelchior commented 5 years ago

You can define any projection with a lon_0 argument, which defines the RA in the middle of the map. It's generally best to adjust the projection so that what you care about is in the middle.

I am not sure what you want to do in the second example, but you can adjust the rotation of the text to follow meridians or parallels, or simply set rotation=0 for horizontal.